/*!
 * jQuery UI Spinner @VERSION
 * http://jqueryui.com
 *
 * Copyright 2014 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/spinner/
 */
(function( factory ) {
    if ( typeof define === "function" && define.amd ) {

        // AMD. Register as an anonymous module.
        define([
            "jquery",
            "./core",
            "./widget",
            "./button"
        ], factory );
    } else {

        // Browser globals
        factory( jQuery );
    }
}(function( $ ) {

    function spinner_modifier( fn ) {
        return function() {
            var previous = this.element.val();
            fn.apply( this, arguments );
            this._refresh();
            if ( previous !== this.element.val() ) {
                this._trigger( "change" );
            }
        };
    }

    return $.widget( "ui.spinner", {
        version: "@VERSION",
        defaultElement: "<input>",
        widgetEventPrefix: "spin",
        options: {
            culture: null,
            icons: {
                down: "ui-icon-triangle-1-s",
                up: "ui-icon-triangle-1-n"
            },
            incremental: true,
            max: null,
            min: null,
            numberFormat: null,
            page: 10,
            step: 1,

            change: null,
            spin: null,
            start: null,
            stop: null
        },

        _create: function() {
            // handle string values that need to be parsed
            this._setOption( "max", this.options.max );
            this._setOption( "min", this.options.min );
            this._setOption( "step", this.options.step );

            // Only format if there is a value, prevents the field from being marked
            // as invalid in Firefox, see #9573.
            if ( this.value() !== "" ) {
                // Format the value, but don't constrain.
                this._value( this.element.val(), true );
            }

            this._draw();
            this._on( this._events );
            this._refresh();

            // turning off autocomplete prevents the browser from remembering the
            // value when navigating through history, so we re-enable autocomplete
            // if the page is unloaded before the widget is destroyed. #7790
            this._on( this.window, {
                beforeunload: function() {
                    this.element.removeAttr( "autocomplete" );
                }
            });
        },

        _getCreateOptions: function() {
            var options = {},
                element = this.element;

            $.each( [ "min", "max", "step" ], function( i, option ) {
                var value = element.attr( option );
                if ( value !== undefined && value.length ) {
                    options[ option ] = value;
                }
            });

            return options;
        },

        _events: {
            keydown: function( event ) {
                if ( this._start( event ) && this._keydown( event ) ) {
                    event.preventDefault();
                }
            },
            keyup: "_stop",
            focus: function() {
                this.previous = this.element.val();
            },
            blur: function( event ) {
                if ( this.cancelBlur ) {
                    delete this.cancelBlur;
                    return;
                }

                this._stop();
                this._refresh();
                if ( this.previous !== this.element.val() ) {
                    this._trigger( "change", event );
                }
            },
            mousewheel: function( event, delta ) {
                if ( !delta ) {
                    return;
                }
                if ( !this.spinning && !this._start( event ) ) {
                    return false;
                }

                this._spin( (delta > 0 ? 1 : -1) * this.options.step, event );
                clearTimeout( this.mousewheelTimer );
                this.mousewheelTimer = this._delay(function() {
                    if ( this.spinning ) {
                        this._stop( event );
                    }
                }, 100 );
                event.preventDefault();
            },
            "mousedown .ui-spinner-button": function( event ) {
                var previous;

                // We never want the buttons to have focus; whenever the user is
                // interacting with the spinner, the focus should be on the input.
                // If the input is focused then this.previous is properly set from
                // when the input first received focus. If the input is not focused
                // then we need to set this.previous based on the value before spinning.
                previous = this.element[0] === this.document[0].activeElement ?
                    this.previous : this.element.val();
                function checkFocus() {
                    var isActive = this.element[0] === this.document[0].activeElement;
                    if ( !isActive ) {
                        this.element.focus();
                        this.previous = previous;
                        // support: IE
                        // IE sets focus asynchronously, so we need to check if focus
                        // moved off of the input because the user clicked on the button.
                        this._delay(function() {
                            this.previous = previous;
                        });
                    }
                }

                // ensure focus is on (or stays on) the text field
                event.preventDefault();
                checkFocus.call( this );

                // support: IE
                // IE doesn't prevent moving focus even with event.preventDefault()
                // so we set a flag to know when we should ignore the blur event
                // and check (again) if focus moved off of the input.
                this.cancelBlur = true;
                this._delay(function() {
                    delete this.cancelBlur;
                    checkFocus.call( this );
                });

                if ( this._start( event ) === false ) {
                    return;
                }

                this._repeat( null, $( event.currentTarget ).hasClass( "ui-spinner-up" ) ? 1 : -1, event );
            },
            "mouseup .ui-spinner-button": "_stop",
            "mouseenter .ui-spinner-button": function( event ) {
                // button will add ui-state-active if mouse was down while mouseleave and kept down
                if ( !$( event.currentTarget ).hasClass( "ui-state-active" ) ) {
                    return;
                }

                if ( this._start( event ) === false ) {
                    return false;
                }
                this._repeat( null, $( event.currentTarget ).hasClass( "ui-spinner-up" ) ? 1 : -1, event );
            },
            // TODO: do we really want to consider this a stop?
            // shouldn't we just stop the repeater and wait until mouseup before
            // we trigger the stop event?
            "mouseleave .ui-spinner-button": "_stop"
        },

        _draw: function() {
            var uiSpinner = this.uiSpinner = this.element
                .addClass( "ui-spinner-input" )
                .attr( "autocomplete", "off" )
                .wrap( this._uiSpinnerHtml() )
                .parent()
                // add buttons
                .append( this._buttonHtml() );

            this.element.attr( "role", "spinbutton" );

            // button bindings
            this.buttons = uiSpinner.find( ".ui-spinner-button" )
                .attr( "tabIndex", -1 )
                .button()
                .removeClass( "ui-corner-all" );

            // IE 6 doesn't understand height: 50% for the buttons
            // unless the wrapper has an explicit height
            if ( this.buttons.height() > Math.ceil( uiSpinner.height() * 0.5 ) &&
                uiSpinner.height() > 0 ) {
                uiSpinner.height( uiSpinner.height() );
            }

            // disable spinner if element was already disabled
            if ( this.options.disabled ) {
                this.disable();
            }
        },

        _keydown: function( event ) {
            var options = this.options,
                keyCode = $.ui.keyCode;

            switch ( event.keyCode ) {
                case keyCode.UP:
                    this._repeat( null, 1, event );
                    return true;
                case keyCode.DOWN:
                    this._repeat( null, -1, event );
                    return true;
                case keyCode.PAGE_UP:
                    this._repeat( null, options.page, event );
                    return true;
                case keyCode.PAGE_DOWN:
                    this._repeat( null, -options.page, event );
                    return true;
            }

            return false;
        },

        _uiSpinnerHtml: function() {
            return "<span class='ui-spinner ui-widget ui-widget-content ui-corner-all'></span>";
        },

        _buttonHtml: function() {
            return "" +
            "<a class='ui-spinner-button ui-spinner-up ui-corner-tr'>" +
            "<span class='ui-icon " + this.options.icons.up + "'>&#9650;</span>" +
            "</a>" +
            "<a class='ui-spinner-button ui-spinner-down ui-corner-br'>" +
            "<span class='ui-icon " + this.options.icons.down + "'>&#9660;</span>" +
            "</a>";
        },

        _start: function( event ) {
            if ( !this.spinning && this._trigger( "start", event ) === false ) {
                return false;
            }

            if ( !this.counter ) {
                this.counter = 1;
            }
            this.spinning = true;
            return true;
        },

        _repeat: function( i, steps, event ) {
            i = i || 500;

            clearTimeout( this.timer );
            this.timer = this._delay(function() {
                this._repeat( 40, steps, event );
            }, i );

            this._spin( steps * this.options.step, event );
        },

        _spin: function( step, event ) {
            var value = this.value() || 0;

            if ( !this.counter ) {
                this.counter = 1;
            }

            value = this._adjustValue( value + step * this._increment( this.counter ) );

            if ( !this.spinning || this._trigger( "spin", event, { value: value } ) !== false) {
                this._value( value );
                this.counter++;
            }
        },

        _increment: function( i ) {
            var incremental = this.options.incremental;

            if ( incremental ) {
                return $.isFunction( incremental ) ?
                    incremental( i ) :
                    Math.floor( i * i * i / 50000 - i * i / 500 + 17 * i / 200 + 1 );
            }

            return 1;
        },

        _precision: function() {
            var precision = this._precisionOf( this.options.step );
            if ( this.options.min !== null ) {
                precision = Math.max( precision, this._precisionOf( this.options.min ) );
            }
            return precision;
        },

        _precisionOf: function( num ) {
            var str = num.toString(),
                decimal = str.indexOf( "." );
            return decimal === -1 ? 0 : str.length - decimal - 1;
        },

        _adjustValue: function( value ) {
            var base, aboveMin,
                options = this.options;

            // make sure we're at a valid step
            // - find out where we are relative to the base (min or 0)
            base = options.min !== null ? options.min : 0;
            aboveMin = value - base;
            // - round to the nearest step
            aboveMin = Math.round(aboveMin / options.step) * options.step;
            // - rounding is based on 0, so adjust back to our base
            value = base + aboveMin;

            // fix precision from bad JS floating point math
            value = parseFloat( value.toFixed( this._precision() ) );

            // clamp the value
            if ( options.max !== null && value > options.max) {
                return options.max;
            }
            if ( options.min !== null && value < options.min ) {
                return options.min;
            }

            return value;
        },

        _stop: function( event ) {
            if ( !this.spinning ) {
                return;
            }

            clearTimeout( this.timer );
            clearTimeout( this.mousewheelTimer );
            this.counter = 0;
            this.spinning = false;
            this._trigger( "stop", event );
        },

        _setOption: function( key, value ) {
            if ( key === "culture" || key === "numberFormat" ) {
                var prevValue = this._parse( this.element.val() );
                this.options[ key ] = value;
                this.element.val( this._format( prevValue ) );
                return;
            }

            if ( key === "max" || key === "min" || key === "step" ) {
                if ( typeof value === "string" ) {
                    value = this._parse( value );
                }
            }
            if ( key === "icons" ) {
                this.buttons.first().find( ".ui-icon" )
                    .removeClass( this.options.icons.up )
                    .addClass( value.up );
                this.buttons.last().find( ".ui-icon" )
                    .removeClass( this.options.icons.down )
                    .addClass( value.down );
            }

            this._super( key, value );

            if ( key === "disabled" ) {
                this.widget().toggleClass( "ui-state-disabled", !!value );
                this.element.prop( "disabled", !!value );
                this.buttons.button( value ? "disable" : "enable" );
            }
        },

        _setOptions: spinner_modifier(function( options ) {
            this._super( options );
        }),

        _parse: function( val ) {
            if ( typeof val === "string" && val !== "" ) {
                val = window.Globalize && this.options.numberFormat ?
                    Globalize.parseFloat( val, 10, this.options.culture ) : +val;
            }
            return val === "" || isNaN( val ) ? null : val;
        },

        _format: function( value ) {
            if ( value === "" ) {
                return "";
            }
            return window.Globalize && this.options.numberFormat ?
                Globalize.format( value, this.options.numberFormat, this.options.culture ) :
                value;
        },

        _refresh: function() {
            this.element.attr({
                "aria-valuemin": this.options.min,
                "aria-valuemax": this.options.max,
                // TODO: what should we do with values that can't be parsed?
                "aria-valuenow": this._parse( this.element.val() )
            });
        },

        isValid: function() {
            var value = this.value();

            // null is invalid
            if ( value === null ) {
                return false;
            }

            // if value gets adjusted, it's invalid
            return value === this._adjustValue( value );
        },

        // update the value without triggering change
        _value: function( value, allowAny ) {
            var parsed;
            if ( value !== "" ) {
                parsed = this._parse( value );
                if ( parsed !== null ) {
                    if ( !allowAny ) {
                        parsed = this._adjustValue( parsed );
                    }
                    value = this._format( parsed );
                }
            }
            this.element.val( value );
            this._refresh();
        },

        _destroy: function() {
            this.element
                .removeClass( "ui-spinner-input" )
                .prop( "disabled", false )
                .removeAttr( "autocomplete" )
                .removeAttr( "role" )
                .removeAttr( "aria-valuemin" )
                .removeAttr( "aria-valuemax" )
                .removeAttr( "aria-valuenow" );
            this.uiSpinner.replaceWith( this.element );
        },

        stepUp: spinner_modifier(function( steps ) {
            this._stepUp( steps );
        }),
        _stepUp: function( steps ) {
            if ( this._start() ) {
                this._spin( (steps || 1) * this.options.step );
                this._stop();
            }
        },

        stepDown: spinner_modifier(function( steps ) {
            this._stepDown( steps );
        }),
        _stepDown: function( steps ) {
            if ( this._start() ) {
                this._spin( (steps || 1) * -this.options.step );
                this._stop();
            }
        },

        pageUp: spinner_modifier(function( pages ) {
            this._stepUp( (pages || 1) * this.options.page );
        }),

        pageDown: spinner_modifier(function( pages ) {
            this._stepDown( (pages || 1) * this.options.page );
        }),

        value: function( newVal ) {
            if ( !arguments.length ) {
                return this._parse( this.element.val() );
            }
            spinner_modifier( this._value ).call( this, newVal );
        },

        widget: function() {
            return this.uiSpinner;
        }
    });

}));
